Governor for dynamos.



c. L. WEICHBLT, GOVERNOR FOR DYNAMOS.

APPLICATION ILED DBO. 11,1907.

v Patented Sept. 22, 1908.

2 SHEETS-SHEET 2.

ATTORNEY.

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. of the city y engine, to advancing or retz'irding the CHARLES L.WEIQIIELT, OF PHILADELPHIA, PENNSYLIAXA.

GOVERNOR FOR DYNAMOS.

To (ill -ulom it ymay concern.:

Be it known that I, CIrAnLEs L. \VmcnEL'r, a citizen of the UnitedStates, and a resident and county of Philadelphia, State ofPennsylvania, have invented eert-ain new and useful Improvements inGovernors for llynamos, of which the following is a. specification.

My invention relates to improvements in devices for governing the speedof a dynamo, and more. particularly to improvements in devices forgoverningT the speed of that form of dynamo which is frietionally drivenby the fly wheel of an internal combustion engine and the current.generated by which is employed to explode thc charges in the cylindersof said engine.

'lo obtain the liest results the. armature of the dynamo should revolve'at practically a constant speed. ln inostinternal combustion enginesthe speed of the. fly wheel, owing to opening or closing of the throttleof the spark, or for some other reason, varies and the s wed of a dynamofrictionall-y driven from tlie wheel will, unless provided' with someform of governing device, also vary. The governing device usually em)loyed is some form of well known centrifugal gm'ernor which is attachedin some way to the dynamo, but the action of this device is such thatthe armature is driven more or less intermittently.

The, purpose of my invention is to furnish a. governing device for africtionallydriven dynamo which will maintain a constant speed of thearmature entirely irrespective of variations in the speed of the drivingmeans,

Another object is to do away with the moving balls or weighted arms ofthe usual form of centrifugal governor, which, being usuallyunprotected, not unfrcquently cause accidents to the operator or otherperson by becoming entangled with their clothing.

In the accompanying drawings forming art of this specification, and inwhich simiar letters of reference indicate similar parts throughout theseveral views :*Figure 1, is a View partly in side elevation and partlyin longitudinal central sectional elevation of my improved governingdevice. Figs. 2, 3 and 4 diagrammatic views of different forms of magnetwinding which I may employ in my invention.

Referring to Fig. l, a is a hollow steel core through which passes theextended shaftvb Specification of Letters Patent.

Patellis-.- Sept. 22, 19,08.

Application led December 11, 1907,. Serial No. 405,989.

` not shown. p is f part of core a., steel shell the '-led as shown at aringf of some brass or fiber.

of the armature, whit-l an angular flange, ferr upon which is mounteforward end of which 1. Opposite the flange :'1 non-magnetic materia-i-Surrounding the core nand between the flange p and the ringj'. themagnetizing coil g. v'llie lead wires 1*? to convey the necessarycurrent from `ie dynamo to the magnet winding are ed through the flangep. d is a bea shown as a ball bearing, securely fasteresi to the innerend of the hollow core a.

'lhe magnet is secured :o the frame of the dynamo and is held ce: al andin alinement with the armature ih r -ihe bearing (Z and the shaft b.Upon the fa- `ended armature shaft I) is mounted loos." 'ie flangedsteel hub 71, to which is secueled friction pulley 'z'. T with a key orfeat-her 'e way fr in shaft b. The hub 71y serves to comph` cuit ofmagnet y and ture of this magnet. portion t of the hub with the beveled1` ront e these beveled surfaces duce the air gap between mature and atthe sant-r tively long movement e the sha-ft l), in other m permits aconsiderable rf: mature without danger r the field of attraction i ofsomewhat less diam that it may revolve fre#L 0 is a spring placed i andsurrounding shaft bears against the bearir to shaft b, and its otheLtension mY of the huh f. mally forces the hub, pr. wards, a collar n,fasti iting its movement in t:

The magnetic circuit t. dieatcd by dotted lines rlhe spring o normaloutwards and holds the` driving wheel. At non gis not sufficiently enernu ro pull against spring o but any incrm se. eed of the pulley fz', isimmediately tralsemtted to the armature shaft b, to which this pulley isfasmagnet g sufficiently to cause it to draw the hub or armature 7itowards it and compress the spring 0, this will result in reducingr thecontact pressure between the pulleyil and the driving wheel and permitthe pulley to slip. The greater the speed ofthe driving wheel thegreater will be the slip of tliepulley 'i and, conversely, theless thespeed of this wheel the less the slip of the pulley..

It will be noted that the pulley'iisnever entirely out of contact withthe driving wheel but is so arranged that it is held more or lesstightly against this wheel as dictated by the action of spring o andmagnet g hence the contact movement of tlie shaft bis constant and notintermittent.

If for any reason the dynamo should fail to generate its proper voltageat a known spcedtlie controlling device would allow the speed to rise orfall unt-il the proper voltage is generated. The air gap between theinagiiet andftlie armature may be varied for adjustment, increasing theair gap increases the speed the dynamo, decreasing it dccreases thespeed.

There is no mechanical connection between tlie coi'trolliiig' magnet gand the armature 7i alii. ,pulley i, the longitudinal movements ofthe-latter are controlled entirely by the foi'i'iicnk and the spring o.rllie device is very sensi vive and responds iiistantly to any chanf'cof electro motive force generated by the dynamo.

In Figs. 2, 3 and 4 diagrammatic arrangements of the dynamo anddiifercnt forms of windings of my magnet are shown. In Fig. 2 aparallelconnection is shown. The leads of magnet are connected across thebrushes `oi" the dynamo so that the f ull voltage of the dynamo act-supon the magnet winding. In this, and the following figures, 1represents the armature, 2 the coniinutator, 3 brushes of the dynamo, 4the terminals, 5 the ield coils, g the controller magnet, 7 the linewires.

In Fig. 3, the magnet i/ is shown connected in series with the fieldcoils. The connection shown in this figure and in Fig. 2 are used whenthe current taken from the dynamo does not have very much variation.

When there is a great variation in the ciir rent from thedynamo adifferential winding, as shown in Fig. 4, is preferred. In this case thefirst, or shunt, winding and connected in series with the outsidecircuits. IVhen there is no current flowing through the series windingthe f ull strength of the shunt winding will act upon the spring therebyreducing the tension between the driving and driven wheel, as soon,however, as 'the current starts to flow through the series winding partof the lines of torce in the shunt will be neutralized thereby weakeningthe pull of the magnet and increasing the contact between the drivingand driven wheel.

Having thus described my invention I claim as new and desire to sccuieby Letters Patent:-

v1. -In a speed governing device of the eliaracter described, incombination, a dynamo, an armature and shaft, a driven pulley, a. hub orarmature slidingly carried by said shaft and carrying said pulley, aspring for controlling the movement of said hub or armo to the windingotsaid electro-magnet. i, 8

2. In a speed governing device of the char,- actcr described, incombination, a dynanid and its shaft, a stationary controlling elec-,tro-magnet surrounding the armature shaftt of said dynamo and subjecttothe changes of u l l electro-motive force generated by said dyi, name,an armature mounted slidiiigly upon V the arinat ure slia'ft of saiddynamo, a friction pulley carried by said sliding armature, and

a spring for forcing said armature and pulley 9591,

away from said magnet.

3. In combination, a dynamo, an armature and its shai t, a stationaryelectro-magnet, carried by the frame ot the dynamo, the core of which ishollow and which surrounds said armature sliaf t, an armature for saidmagnet mounted slidingly upon said shaft, a friction pulley carried bysaid magnet armature, a spring within said hollow magnet core opel'-ating to force said magnet armature and` pulley outward, and connectionsbetween thea held coils of said dynamo and the winding of saidelectro-inagiiet. i

CHARLES L. WEICHELT.

IVitnesses:

GEORGE V. SELTZER,

CHARLES A. RUTTER.

